RE:RE:RE:Just an Observationgoldhunter11 wrote: jjjjsss,
As long as we keep in mind that the above discussion was based on the short ton ( =2000 lbs). Under the metric system it's the long ton ( the weight of 1 cubic metre of water which has an s.g. of 1; 1 tonne = 2200 lbs). There is a 10% difference between tonne and ton.
It gets a bit tricky when it comes to the conversion of ton (especially tonne) into cubic feet, since this would depend on the specific gravity (s.g.) of the sandstone which has a variation of about 27% (2.2 to 2.8). So, the total variation would be 10 + 27 = 37%.
This is important for the accuracy the gold grade estimate in gpt. People would conventionally use tonne in the calculation, since 1 tonne = 1000kg (simpler to do the math), and 1 gpt = 1ppm, etc.)
A 37% variation in gold grade would result in $M in loss or profit. So, it pays to know what was used in the estimate by the company (too conservative or optimistic).
Cheers,
GH
Very interesting, thank you for the explanation.
Average Specific Gravity of Various Rock Types: https://www.edumine.com/xtoolkit/tables/sgtables.htm
cheers!